scholarly journals Topographic growth around the Orange River valley, southern Africa: A Cenozoic record of crustal deformation and climatic change

Geomorphology ◽  
2015 ◽  
Vol 233 ◽  
pp. 5-19 ◽  
Author(s):  
Olivier Dauteuil ◽  
Paul Bessin ◽  
François Guillocheau
Keyword(s):  
Climatic Change ◽  
Southern Africa ◽  
Crustal Deformation ◽  
River Valley

scholarly journals The Cross Sections of Glaciated Valleys

1947 ◽  
Vol 1 (1) ◽  
pp. 37-38 ◽  
Author(s):  
W. V. Lewis
Keyword(s):  
Climatic Change ◽  
Cross Section ◽  
Cross Sections ◽  
River Valley ◽  
Freezing And Thawing ◽  
Melt Water ◽  
The Cross ◽  
Shaped Cross Section

The typical U-shaped cross-section of glaciated valleys is well known but little understood. If a climatic change results in a glacier occupying a deep river valley, and some erosion is assumed to occur wherever the ice makes contact with the bedrock, then a partial change from the “V” to “U” section is to be expected. A more potent agency in such a change is probably the sapping of the valley sides by the alternate freezing and thawing of melt-water flowing down to, and under, the glacier. This has been briefly suggested by de Martonne and worked out somewhat more fully in the case of cirques1

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